Grand Index Solution Enterprise Limited established in 2009, and based in HongKong, China. It's a professional distributer of excellent products that covered from aquatic to laboratory to industrial to business to educational and even for personal or home use.To all people in the world, offer all kinds of optical instruments, measuring tools and testing tools. These includes refractometers, pH/mV/EC/TDS/CF Meters, Gem pocket scales, Loupes/Magnifier, Digital Thermometers, Calipers and Gauge, micrometers, Fiber inspection tools, Microscopes, all kinds of instruments for gemstones' quick testing, LED ring light for lab using and all kinds of tools for house hold using, also for these instruments' components...Grand Index promise is "all products from us must at High Quality, Low cost, Guaranteed with Excellent service and speedy shipment". You can be confident that you are transacting with an experienced seller with a proven commitment to customer satisfaction.